Apple Security Checklist Companion · 2016. 8. 15. · 4 Introduction Target Audience The Apple...

Apple Security Checklist Companion

A practical guide for automating security standardsin the Apple Enterprise with the Casper Suite

June 2010

JAMF Software, LLC© 2010 JAMF Software, LLC. All Rights Reserved.

JAMF Software has made all efforts to ensure that this guide is accurate.

JAMF Software301 4th Ave S Suite 1075Minneapolis, MN 55415-1039(612) 605-6625

JAMF Software, the JAMF Software logo, the Casper Suite, Casper Admin, Casper Imaging, Casper Remote, Casper VNC, Composer, the JAMF Software Server (JSS), JSS Mobile, JSS Set Up Utility, JAMFVNC, Recon and Recon for PC are all trademarks of JAMF Software, LLC registered in the US.

Apple, the Apple logo, AirPort, AppleScript, AppleShare, AppleTalk, Bonjour, Boot Camp, ColorSync, Exposé, FileVault, FireWire, iCal, iChat, iMac, iSight, iTunes, Keychain, Leopard, Mac, Mac Book, Macintosh, Mac OS,QuickTime, Safari, Xgrid, Xsan, and Xserve are trademarks of Apple Inc., registered in the U.S. and other countries.

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Contents

Introduction 4 Target Audience 4 How to use this guide 4 Acknowledgements 5 Regulatory Compliance Frameworks 6 Useful Links on Security Concern

ASC Guide 7 Installing Mac OS X 8 Protecting System Hardware 9 Securing Global System Settings 10 Securing Accounts 11 Securing System Preferences 13 Securing Data Using Encryption 14 Information Assurance with Applications 15 Information Assurance with Services 17 Advanced Security Management

Appendix A 18 Meeting Sarbanes-Oxley Objectives 20 Role Based Administrator Access 21 Software Restriction 24 CasperVNC Security 25 Change Local Administrator Account Password 29 Enforce Screen Saver Settings 31 Protocol Security

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Introduction

Target Audience

The Apple Security Checklist Companion (ASCC) is intended for IT practitioners engaged in governance, compliance and security related to Macintosh OS X computers.

How to Use This Guide

The ASCC is a companion document to be used in conjunction with Mac OS X Security Configuration Guide For Version 10.6 (Snow Leopard) published in May of 2010. Please download a copy from the link found below and become familiar with the security guidelines set forth by Apple with contributions made by the NSA, NIST and DISA.

Using Apple’s guidelines as the authoritative source for security standards on Mac OS X, the ASCC provides you with an index of how to automate compliance with these standards using the Casper Suite.

Acknowledgements

JAMF Software would like to thank Apple Computer for not only publishing the security guide, but for the guidance they have provided regarding security on the platform. Additionally, we’d like to thank the security experts from our customer community for the insights that they have lent us as we have grown our understanding in this increasingly critical area for the Mac OS.

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Regulatory Compliance Frameworks

The increased need for security automation is driven by organizations looking to provide a more secure computing environment as well as being driven by regulatory mandates.

For government institutions, the current iteration of the Federal Desktop Core Configuration (FDCC) does not include Mac OS computers. For those in the public sector, Sarbanes-Oxley requirements are not clearly articulated for Apple hardware, leaving the responsible system administrator at a loss for how to comply specifically when administering Apple hardware.

This companion document follows the Apple guide in providing a “How to automate...” the What and the Why provided by Apple. As standards continue to emerge, this document will be updated to reflect the evolving landscape of security on Mac OS platform. Appendix A looks more in depth at Sarbanes-Oxley controls and supercedes the document titled “Security and Casper.”

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Useful Links on Security Concerns

Mac OS X Security Configuration Guides

http://www.apple.com/support/security/guides/

Mac OS X v10.6 (Snow Leopard)

Mac OS X Security Configuration Guide

Mac OS X Server Security Configuration Guide

Mac OS X v10.5 (Leopard)

Mac OS X Security Configuration GuideMac OS X Server Security Configuration Guide

Mac OS X v10.4 (Tiger)

Mac OS X Security Configuration GuideMac OS X Server Security Configuration Guide

Mac OS X v10.3 (Panther)

Client Security Configuration GuideServer Security Configuration Guide

* There are additional links found within each of these guides. As a matter of practicality, this document is based on the Mac OS X v10.6 (Snow Leopard) security guide and the links found on pages 15 and 16 provide a wealth of information from Apple and US Government agencies and should be pursued as part of any inquiry into securing Mac OS client machines.

http://www.apple.com/support/security/guides/http://images.apple.com/support/security/guides/docs/SnowLeopard_Security_Config_v10.6.pdfhttp://images.apple.com/support/security/guides/docs/SnowLeopard_Server_Security_Config_v10.6.pdfhttp://images.apple.com/support/security/guides/docs/SnowLeopard_Server_Security_Config_v10.6.pdfhttp://images.apple.com/server/macosx/docs/Leopard_Server_Security_Config_v10.5.pdfhttp://images.apple.com/server/macosx/docs/Tiger_Security_Config_021507.pdfhttp://images.apple.com/server/macosx/docs/Tiger_Server_Security_Config_021507.pdfhttp://images.apple.com/support/security/guides/docs/Panther_Security_Config.pdfhttp://images.apple.com/support/security/guides/docs/Panther_Server_Security_Config.pdf

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Installing Mac OS X

For hardening security on Mac OS X systems and maintaining that security Apple provides the Mac OS X Security Configuration guide as a source of instructions and recommendations. By using The Casper Suite your chosen security configuration can be implemented and maintained throughout the life cycle of your managed Macs. This document, which is based off of the Apple Security Checklist (ASC) that is included in the Mac OS X Security Configuration guide, details the deployable objects and the Casper Suite deployment mechanisms that can be used to implement Apple’s recommended security actions.

Installation Action Items

Action Item ASC Page

Deployable Object Deployment Mechanism

Securely erase the Mac OS X partition before installation

31 Script Casper Imaging

Install Mac OS X using Mac OS Extended disk formatting

32 OS Image Casper Imaging

Do not install unnecessary packages 31 OS Image Casper Imaging

Do not transfer confidential information in Setup Assistant

33 OS Image Casper Imaging

Do not connect to the Internet 31 OS Image, Stand Alone JSS

Casper Imaging and JSS on a secure network or FireWire drive

Create administrator accounts with difficult-to-guess names

34 Script, DMG Casper Imaging, Casper Remote, Policy

Create complex passwords for administrator accounts

34 N/A All Casper Suite products have support for complex passwords.

Do not enter a password-related hint; instead, enter help desk contact information

34 Script, Managed Preference

Casper Remote, Policy

Casper Remote, Policy 33, 91

Script, DMG Casper Imaging, Casper Remote, Policy

Enter correct time settings and set NTP time server

35, 75

Script, DMG, *Managed Preference

Casper Imaging, Casper Remote, Policy, JSS

Turn off Auto-login 35 OS Image, *Managed Preference

Casper Imaging, JSS

Use an internal Software Update server

36 Setting, *Managed Preference

JSS

Update system software using verified packages

38 Software Update Server PKG, DMG HTTP Downloads

Casper Imaging, Casper Remote, Policy

Repair disk permissions after installing software or software updates

40 Setting Casper Imaging, Casper Remote, Policy

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When hardening Mac OS X desktop systems after installation, protect your system hardware with the following:

Action Items from ASC Page are managed by a Deployable Object using the appropriate Deployment Mechanism.

Hardware Action Items



Restrict access to rooms that have computers

43 N/A N/A

Store computers in locked or secure containers when not in use

43 N/A N/A

Disable Wi-Fi Support Software 45 Script-Complete Removal, *Managed Preference-Disable Only

Casper Imaging, Casper Remote, Policy, Resource Kit

Disable Bluetooth Support Software 46 Script, *Managed Preference (Disabled Only)

Casper Imaging, Casper Remote, Policy, Resource Kit

Disable Audio Recording Support Software

48 Script Casper Imaging, Casper Remote, Policy

Disable Video Recording Support Software

49 Script Casper Imaging, Casper Remote, Policy

Disable USB Support Software 51 Script Casper Imaging, Casper Remote, Policy, Resource Kit

Disable FireWire Support Software 52 Script Casper Imaging, Casper Remote, Policy

Protecting System Hardware

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Securing Global System Settings

When hardening Mac OS X desktop systems during installation, initialization or updating, reference the following:


Global System Action Items



Require an EFI password 54 DMG, OS Image, Script Casper Imaging, Casper Remote, Policy

Create an access warning for the login window

57 DMG, OS Image, Script, *Managed Preference


Create an access warning for the command line

60 DMG, OS Image, Script Casper Imaging, Casper Remote, Policy

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Securing Accounts



System Preferences Action Items



Log in with administrator privileges 63 N/A N/A

Enable MobileMe only for user accounts without access to critical data

64 Script, DMG, *Managed Preference


Securely configure MobileMe preferences



Securely configure Accounts preferences



Securely configure Appearance preferences



Change the number of recent items displayed



Securely configure Appearance preferences


Securely configure CD & DVD preferences



Securely configure Date & Time preferences

75 Script, *Managed Preference


Securely configure Desktop & Screen Saver preferences

77 Script, User Environment Package, *Managed Preference


Securely configure Display preferences



Securely configure Dock preferences 79 Script, User Environment Package, Unix Command, *Managed Preference


Securely configure Energy Saver preferences

80 Script, Resource Kit, *Managed Preference


Configure Exposé & Spaces Preferences

83 Script, Unix Command Casper Imaging, Casper Remote, Policy

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Securing System Preferences



System Preferences Action Items



Securely configure Keyboard 84 Script, Unix Command, *Managed Preference


Securely configure Mouse preferences

84 Script, Unix Command, *Managed Preference


Securely configure Print & Fax preferences

96 Script, User Environment Package


Securely configure Network preferences

85 Script, User Environment Package, Unix Command


Securely configure Parental Control preferences

93 DMG, Managed Preference


Securely configure Security preferences



Securely configure Sharing preferences



Securely configure Software Update preferences

107 Script, Policy, JSS Setting, User Environment Package, Unix Command

Casper Imaging, Casper Remote, Policy, JSS Setting

Securely configure Sound preferences

109 Script, User Environment Package


Securely configure Speech preferences



Securely configure Spotlight preferences


Securely configure Startup Disk preferences


Securely configure Time Machine preferences

115 Script, Unix Command, *Managed Preference


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Account Configuration Action Items



Create an administrator account and a standard account for each administrator

124 JSS Setting, QuickAdd, Script

Casper Imaging, Casper Remote

Create a standard or managed account for each nonadministrator

124 QuickAdd, Script Casper Imaging, Casper Remote, Policy

Set parental controls for managed accounts

121 Script, DMG, Managed Preference


Restrict sudo users to access required commands


Securely configure LDAPv3 access 129 Script, DMG Casper Imaging, Casper Remote, Policy

Securely configure Active Directory access


Use Password Assistant to generate complex passwords

130 Setting Casper Remote, Policy

Authenticate using a smart card, token, or biometric device

132 DMG Casper Imaging, Casper Remote, Policy

Set a strong password policy 134 Script, Unix Command Casper Imaging, Casper Remote, Policy

Secure the login keychain 135 Script, Unix Command Casper Imaging, Casper Remote, Policy

Secure keychain items 137 Script, Unix Command Casper Imaging, Casper Remote, Policy

Create keychains for specialized purposes


Use a portable drive to store keychains

139 DMG Casper Imaging, Casper Remote, Policy

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Securing Data Using Encryption



Encryption (DAR) Action Items



Assign POSIX access permissions based on user categories

144 Script, Unix Command, Composer Setting


Review and modify folder flags 146 Script, Unix Command, Composer Setting


Restrict permissions on User Home Folders


Strip setuid bits from some programs 149 Script, Unix Command, Composer Setting


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Information Assurance with Applications



Application Configuration Action Items



Configure Mail using SSL 166 Script, *Managed Preference


Disable the Preview Pane for Mail Messages

168 Script Apple recommends moving the separator bar to minimize the preview pane. Is this MCX-able?

Disable Auto-Fill 175 DMG, *Managed Preference


Block Pop-ups 176 DMG, *Managed Preference


Only Allow Cookies from Visited Sites 177 DMG, *Managed Preference


Disable opening safe files in Safari 177 DMG, *Managed Preference


Verify certificate validity 171 Script Casper Imaging, Casper Remote, Policy

Request MobileMe identity certificate 180 Script Casper Imaging, Casper Remote, Policy

Secure iChat communications 178 Script, *Managed Preference


Create a strong password for iTunes 181 N/A N/A

Secure remote access using VPN 192 DMG, Script, *Managed Preference


Turn firewall protection on 183 Script, Resource Kit, Managed Preference


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Information Assurance with Services



Services Action Items



Configure IPFW2 firewall 187 OS Image, Package, Script


Implement IPFW ruleset 189 OS Image, Package, Script


Enable firewall logging 188, 103

OS Image, Package, Script


Implement inclusive ruleset 189 OS Image, Package, Script


Set ruleset to permit services 190 OS Image, Package, Script


Set more restrictive ruleset 190 OS Image, Package, Script


Configuring System to load IPFW ruleset

192 OS Image, Package, Script


Bonjour 194 Script Casper Imaging, Casper Remote, Policy

Secure BTMM access through Security Preferences (Back To My Mac)

198 Script, User Environment Package, Managed Preference


Set up screen sharing through VNC with password protection


Disable Screen Sharing when possible

200 OS Image, Script Casper Imaging, Casper Remote, Policy

Disable File Sharing when possible 201 OS Image, Script Casper Imaging, Casper Remote, Policy

Disable Printer Sharing when possible


Disable Scanner Sharing when possible


Disable Web Sharing when possible 204 OS Image, Script Casper Imaging, Casper Remote, Policy

Disable Remote Login when possible 205 OS Image, Script Casper Imaging, Casper Remote, Policy

Establish key-based SSH connections 207 Script Casper Imaging, Casper Remote, Policy

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Services Action Items Cont.



Configure ARD to manage remote tasks

215 Script, Built In Feature Casper Imaging, Casper Remote, Policy

Disable Remote Management when possible


Disable Remote Apple Events when possible


Disable Xgrid Sharing when possible 217 OS Image, Script Casper Imaging, Casper Remote, Policy

Disable Internet Sharing when possible


Disable Bluetooth Sharing when possible


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Advanced Security Management



Advance Management Action Items

*Available as a template in the JSS



Create an authorization right to the dictionary to authorize users



Create a digital signature 232 Script Casper Imaging, Casper Remote, Policy

Enable security auditing 237 Script Casper Imaging, Casper Remote, Policy

Configure security auditing 222, 238

Script Casper Imaging, Casper Remote, Policy

Generate auditing reports 222, 237

Script Casper Imaging, Casper Remote, Policy

Enable local logging 235 Script, Managed Preference


Enable remote logging 220, 236

Script, Managed Preference


Install a file integrity checking tool 216, 232

DMG Casper Imaging, Casper Remote, Policy

Create a baseline configuration for file integrity checking

216, 231

OS Image N/A

Install an antivirus tool 222, 239

DMG Casper Imaging, Casper Remote, Policy

Configure the antivirus tool to automatically download virus definition files

222, 239

DMG, Managed Preference


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Appendix A - Meeting Sarbanes-Oxley Objectives

There are seven Control Objectives that relate to desktop management under Sarbanes-Oxley requirements that are met through the Casper Suite.

They are:

• Grant the appropriate level of access in order to provide administrators functionality appropriate to their role.

• Log the actions of each individual administrator.

• Ensure that no illegal or unauthorized software can be run on corporate assets by excluding applications from execution.

• Allow remote administrators to observe or control a computer in a way that is secure and audited.

• Rapidly change access credentials for remote computers

• Ensure that desktop screen savers activate after a set amount of time and require a password to unlock.

• Ensure that data transmission is encrypted.

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Appendix A - Meeting Sarbanes-Oxley Objectives

While most system administrators governed by Sarbanes-Oxley are fluent in the terminology of the framework, a brief explanation of controls is provided below.

Automated Controls are performed by computers and are binary in nature; they always function as designed and are not subject to intermittent error or human intervention.

Access Controls define the appropriate access for different users and grant them rights and privileges to sensitive information.

Control Objectives define the desired state and are used to measure the success or failure of a policy or procedure.

Corrective Controls are aimed at restoring the system to its expected state.

Detective Controls detect when an unwanted event occurs as a result of human factors as well as en vironmental and security issues; we need detective controls to alert us when an unwanted event transpires.

Preventative Controls are aimed at avoiding unwanted situations.

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Role Based Administrator Access

Control Objectives

• Grant the appropriate level of access in order to provide administrators functionality appropriate to their role.

• Log the actions of each individual administrator.

Within the Casper Suite, individuals can be added to the system to perform the tasks for which they are responsible (see fig. 1).

fig. 1

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These users can be added via LDAP and assigned appropriate privileges (see fig. 2).

fig. 2

Grant All Privileges Revoke All Privileges

JSS - Home Tab Privileges

Change Password

JSS - Inventory Tab Privileges

View Inventory Tab

Perform Advanced Searches

Save Advanced Searches

View Saved Searches

Add Computers Manually

View Details on Inventory Items

View License Serial Numbers

Download Files Attached to Inventory Items

View Computer Logs

Edit Inventory Items

Edit Autorun Data

Delete Inventory Items

JSS - Management Tab Privileges

View Management Tab

Manage Policies

Manage PreStages

Manage Restricted Software

Manage Smart Computer Groups

Manage Static Computer Groups

Manage Management Preferences

Manage Self Service Preferences

Manage Scheduled Tasks

Manage Directory Bindings

Manage Distribution Points

Manage Software Update Servers

Manage NetBoot Servers

JSS - Logs Tab Privileges

View Logs Tab

Flush Policy Histories

JSS - Settings Tab Privileges

View Settings Tab

Manage JSS Accounts

Manage LDAP Servers

Manage Buildings and Departments

Manage Network Segments

Manage General JSS Settings

View Database/Web Application Health

Flush Database Logs

Mass Edit Locations/Servers

Mass Edit Warranties

Mass Edit Autorun Data

Mass Add SSH Accounts

Mass Edit SSH Accounts

JSS - Settings Tab Inventory Privileges

Manage Inventory Preferences

Manage Peripheral Types

Manage Removable MAC Address

Manage Custom Reports

Manage Saved Searches

Manage Licensed Software

Manage Supressed Inventory Items

Recon Privileges

Add Hardware

Add Computers Remotely

QuickAdd Packages

Casper Admin Privileges

Use Casper Admin

Save with Casper Admin

Casper Imaging Privileges

Use Casper Imaging

Customize a Configuration

Store Autorun Data

Create Local Accounts

Bind to Active Directory Locally

Set Open Firmware Locally

Modify Network Settings Locally

Set ARD Fields Locally

Use Advanced Options Locally

Casper Remote Privileges

Use Casper Remote

Install/Uninstall Software Remotely

Run Scripts Remotely

Map Printers Remotely

Add Dock Items Remotely

Manage Local User Accounts Remotely

Change Casper’s SSH Accounts Remotely

Bind to Active Directory Remotely

Set Open Firmware/EFI Passwords Remotely

Reboot Computers Remotely

Perform Maintenance Tasks Remotely

Search for Files/Processes Remotely

VNC Privileges

Observe Remote Computers

Observe Remote Computers Without Asking at Login Window

Observe Remote Computers Without Asking

Control Remote Computers

Control Remote Computers Without Asking at Login Window

Control Remote Computers Without Asking

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When an individual administrator logs into any of the Casper Suite applications, his actions are logged in the database. The example provided below illustrates a sample log listing which users controlled a particular desktop computer (see fig. 3). Creating users and assigning their rights falls under Access Control; the logging of events allows for a Procedure that audits the veracity of the Control.

fig. 3

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Software Restriction

Control Objectives

• Ensure that no illegal or unauthorized software can be run on corporate assets by blacklisting applications.

Ensuring that software that violates computer usage polices, such as Peer to Peer file sharing applications, are controlled requires the identification and removal of software that is out of scope, and notification about these activities to end user and management. In the case of software restriction (see fig. 4), the Casper Suite offers the following:

• Detection of software by the process that loads into Random Access Memory (RAM), which is a Detective Control.

• Quitting and removing the offending Application, which is a Preventative Control

• Notification to end user and system administrators allows for a Procedure that enforces the Control.

fig. 4

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CasperVNC Security

Control Objectives

• Allow remote administrators to observe or control a computer in a way that is secure and audited.

Casper VNC tunnels connections through SSL, which is an Access Control on data transmission from source to host. The VNC server is launched on demand when trying to control or observe a remote client, then quit when the administrator quits the Application. This Preventative Control ensures that only authorized Administrators can access machines during an active session and eliminates concerns about passive reception from intrusion.

Every connection and all remote control, including VNC, are logged centrally in a database as illustrated in fig. 3 above.

With the introduction of Version 6 of the Casper Suite, there is now the additional capability of sending all administrator actions to a CMDB/syslog server by specifying the directory, hostname and port of the server (see fig. 5).

fig. 5

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Change Local Administrator Account Password

Control Objectives

• Rapidly change Administrator account access on all computers.

Utilizing the remote features in either the Casper Remote application (see fig. 6) or via a policy (see fig. 7,8,9) the password used to access the remote computers can be updated immediately for the computers that are online and will poll for missing computers until they are found. This Access Control ensures that any security breach involving a compromised administrator can be resolved within minutes.

fig. 6

26


To change local administrator accounts via a policy, first determine the trigger (start up, login, logout, shut down, time of day, timed frequency, etc.), activation date and execution frequency.

fig. 7

27


The next step is to assign computers or groups, in this case we are applying the policy to all computers.

fig. 8

28


The last step is to set the command to reset the admin password. In this case we are resetting both the local admin account as well as the account used by the Casper Suite.

fig. 9

29

Enforce Screen Saver Settings

Control Objectives

• Ensure that desktop screen savers activate after a set amount of time and require a password to unlock.

The Composer application is used to extract system settings (plist entries) from a machine (see fig. 10) that has the proper time activation and security settings that enforces Access Control of the Operating System.

fig. 10

30

Enforce Screen Saver Settings

These settings can be remotely distributed to target machines (see fig. 11) and then reinforced on any system event or custom timing via a Policy or Managed Preference (see fig. 12). The Policy or Managed Preference is used to ensure that the Access Control is enforced in a reasonably persistent manner.

fig. 11

fig. 12

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Protocol Security

Control Objectives

• Ensure that data transmission is encrypted.

The central component of the Casper Suite, the JAMF Software Server (JSS), communicates with the other applications using industry standard SSL encryption that allows for a single point of management.

The Increasing Importance of IT ‘Controls’ http://itmanagement.earthweb.com/netsys/article.php/3402561 September 1, 2004 By George Spafford

IT Control Objectives for Sarbanes-Oxley: The Role of IT in the Design and Implementation of Internal Control Over Financial Reporting, 2nd Edition IT Governance Institute 3701 Algonquin Road, Suite 1010 Rolling Meadows, IL 60008 USA

While this list addresses many of the primary Controls that Sarbanes-Oxley governs concerning Desktop Management, it is by no means exhaustive. In the absence of clear definitions or standards of conduct, the above solutions meet specific objectives that demonstrate a company’s willingness to abide by the spirit of the law.
http://itmanagement.earthweb.com/netsys/article.php/3402561

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